<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>紧凑的对称布局</title>
    <style>
        #container {
            width: 90vw;
            height: 90vh;
            position: relative;
        }
        .item {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            text-align: center;
            line-height: 50px;
            background-color: pink;
            position: absolute;
        }
    </style>
</head>
<body>
    <div id="container">
        <div class="item" id="item_1">1</div>
        <div class="item" id="item_2">2</div>
        <div class="item" id="item_3">3</div>
        <div class="item" id="item_4">4</div>
        <div class="item" id="item_5">5</div>
        <div class="item" id="item_6">6</div>
        <div class="item" id="item_7">7</div>
        <div class="item" id="item_8">8</div>
        <div class="item" id="item_9">9</div>
        <div class="item" id="item_10">10</div>
        <div class="item" id="item_11">11</div>
        <div class="item" id="item_12">12</div>
        <div class="item" id="item_13">13</div>
    </div>
    <script src="./01_data.js"></script>
</body>
</html>
